Q.

The correct order of acidic nature of trioxide is

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a

SO3, > SeO3, > TeO3,

b

SO3 > TeO3, > SeO3,

c

TeO3, > , SO3, > SeO3

d

SO3 < SeO3, < TeO3,

answer is A.

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Detailed Solution

Acidic nature decreases down the group with the decrease in electronegativity of central atomSO3+H2O⟶H2SO4 SeO3+H2O⟶H2SeO4 (Selenic acid) TeO3+H2O⟶H2TeO6               (Telluric acid)
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The correct order of acidic nature of trioxide is